| Season 2, Episode 05|
| Written &|
"Lightning Sword" is the fifth episode in the second season of CamDog and ACat's episodes. It is the thirty-first episode overall.
Finn finds himself in need of a sword, so Jake and Tai board the dungeon train to reclaim the lightning sword Finn left behind.
- Princess Bubblegum
- Flame King (mentioned, in flashback)
- Cinnamon Bun (in flashback)
- Gumball Guardians
- Candy People
- Peppermint Butler
- Crystal Ants
- Hair Apes
- Joshua (corpse)
- Clone James
- Goo Monsters
- Tai's Father
- Tai is seen without his ring for the first time since "Regular Time".
- Princess Bubblegum tells Finn that she has started colonizing the Desert of Wonders, like she tried to in "James", and that the area is clear of Goo Monsters. This is because they crawled out of the pit with the infected James at the end of that episode.
- Technically, if Joshua's corpse was already on the dungeon train in this episode, Finn should have already disappeared.
- The Root Sword becomes Finn's primary weapon at the end of this episode for the second time in the series.
- This episode's plot is continued in the next episode.
- This is the first episode in season two of CamDog and ACat's episodes to not include Lake Princess/Attie or have her mentioned in.