Thomas

Thomas is a character original from a Kids TV Show; Thomas & Friends. He is a ridiculously expensive summoner, and is arguably the best late-game tower in the game (alongside mecha). Farms are more or less necessary if you want this tower to actually do something. There was a glitch with this tower when you sell it, instead of giving 3000 cash, it gave you 30,000 cash until it got patched, lasting for a few days without notice.

Trivia
the tower is based off a tv show called "Thomas & Friends".