Season 3

• After First Monday was cancelled, Sheffield became a recurring character on JAG.
• NCIS backdoor pilots are JAG 8x20 and 8x21.
• NCIS LA pilots are NCIS 6x22 and 6x23.
  
• The NCIS episode "Endgame" (7x07) continued on the events that had taken place in the NCIS: Los Angeles episode "Killshot" (1x05).
• Abby guests on NCIS LA 1x09
• Kensi from NCIS: Los Angeles also guests in Hawaii Five-O 2x06, they mention this in NCIS LA 3x06
• A.J. Chegwidden is making guest appearance in NCIS 10x24
• NCIS: LA and Hawaii Five-O cossover: HFO 2x21, NLA 3x21
• NCIS: New Orleans pilots are NCIS 11x18 and 11x19
• Hetty also guests in Scorpion 1x06
• Gibbs helps out Pride in NCIS New Orleans 1x03
• CGIS Agent Abigail Borin known from NCIS seasons pops up in NCIS NO 1x12
• NCIS: Red pilots were NCIS LA: 4x18 and 4x19 but the concept was not taken up.
• DiNozzo asks help from the LA team in NCIS LA 7x05
• Sister City: Part 1 is the 12th episode of NCIS Season 13 and the second part, "Sister City, Part II" as part of NCIS: New Orleans Season 2.
• The story plot loosely connected between MacGyver 1x15 and Hawaii Five-0 7x17
• In MacGyver episode “Flashlight” (1x18), Mac and the team team up with Chin and Kono from the Five-0 task force. They mention this in Hawaii Five-0 7x19.
• NCIS 14x15 and NCIS New Orleans 03x14 are a two part crossover, Pandora's Box .
• A.J. Chegwidden pops up again several times in NCIS LA Season 8 (8x15, 8x21, 8x22)
• Bud Robert Jr. from JAG guests in NCIS 14x1
• Noelani Cunha from Hawaii Five-0 appears in Magnum PI (2018 ) pilot and 1x14 episodes
• Kamekona from HF0 appears on Magnum PI several times (1x02, 1x13, 2x06, 2x12, 2x13, 2x14, 2x18)
• Gibbs visits NCIS: New Orleans 5x01
• Lead roles of JAG: Harmon Rabb and Sarah MacKenzie show up in NCIS LA 10x23 and 10x24
• HFO 10x12 and Magnum 02x12 are a two part crossover
• HFO 10x18: Rick from Magnum PI helps Five-0 with a case
• MacGarret was mentioned in NCISLA 11x11
• Sarah MacKenzie show up a couple of times in first and last episodes of NCIS LA Season 11

• Adam Noshimuri pops up and Tani is mentioned in Magnum 2x20

• NCIS s19e17 / NCISH s01e18 - two parts crossover

• NCIS s19e19 - character appearance form NCIS Hawaii

• NCIS s20e01 / NCISH s02e01 - two parts crossover

• NCIS s20e10 / NCISH s02e10 / NCISLA s14e10 - three parts crossover

rearranging under construction

Oh yeah

I've got the stuff

Full seasons of shows watched