From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Unlike most other energy attacks, the Dodonpa seems to be something of a superheated beam shot from the finger. An example is shown when a person who was covered in bandages because of burns caused by the attack appeared during the Tien Shinhan Saga.
The Kamehameha is inferior to the Dodonpa according to Turtle Hermit. It is definitely more powerful than an average Kamehameha. Unlike the Kamehameha, however, it does not seem to require much charging, but will definitely be much more powerful when doing so. Also unlike the Kamehameha, which relies more on brute force to blast an enemy away, the Dodonpa is more concentrated in piercing through a specific point on the body.
This stronger version of the Dodonpa requires the user to charge up as much power as possible and then fire it at their opponent, rather than shoot multiple, weaker Dodonpa. It also creates a much bigger explosion upon impact. Chaozu uses this in his match against Kuririn after Crane Hermit orderes him to kill Kuririn during their match. There are, however, much more powerful variations of the attack that exist such as the Super Dodon Blast and the Super Dodonpa.
Dragon Ball Z
Piccolo used a similar attack against his clone while training for the Saiyans' arrival on Planet Earth. The color was red and orange, however, instead of only orange.
Frieza Saga and Cell Saga
Budokai video game series
Budokai Tenkaichi video game series
In the Dragon Ball Z: Budokai Tenkaichi video game series, Cyborg Tao Pai Pai's version of the Dodonpa is named the Original Dodon Ray. He removes one of his metal hands to fire it fueled by both his mechanical and organic components which lands a heavy amount of damage.
Dragon Ball Online
- Super Dodon Blast - A much more powerful adaptation of the technique which is only seen in use by Chaozu.
- Super Dodonpa - The strongest adaptation of the Dodonpa which is used by Cyborg Tao in Dragon Ball Z against Tenshinhan, however, it dispersed in mid-air with a simple Kiai when Tao launched it after cutting Tenshinhan's chest with a concealed knife.