Agumon is a Rookie Digimon. It is a dinosaur-like Digimon who was a major character in the first season of the Digimon anime series with his DigiDestined Tai. Of all the original DigiDestined's Digimon, Agumon was always the first Digimon to digivolve to a stronger form.
In the English dub version of Digimon Adventure, Agumon was voiced by Michael Lindsay for the first two episodes. For the rest of Digimon Adventure, Digimon Adventure 02, and the Digimon Adventure films Agumon was voiced by Tom Fahn.
For Digimon Data Squad, a completely different Agumon from the previous series was voiced by Brian Beacock.
In the Digimon Adventure movie a "Big Agumon" completely different from Tai's Agumon made a brief appearance voiced by Michael Sorich.