1st episode - Voltron: Legendary Defender 01x01 "The Rise of Voltron"
10th episode - Voltron: Legendary Defender 01x10 "Collection and Extraction"
50th episode - Haikyuu!! 01x12 "The Neko-Karasuno Reunion" (rewatch)
100th episode - Supernatural 13x12 "Various & Sundry Villains"
150th episode - Gravity Falls 02x15 "The Last Mabelcorn"
200th episode - Run BTS! 01x51 "The 50th Episode Special: Part 2"
250th episode - Merlin 01x04 "The Poisoned Chalice"
300th episode - Merlin 04x05 "His Father's Son"
350th episode - BTS: Bon Voyage 03x01 "We are going to Mediterranean Sea"
400th episode - The Try Guys 10x48 "The Try Guys Wear Women's Pants"