verb
1
BAD : One day these innocent victims must be revenged.
GOOD : One day these innocent victims must be avenged.
BAD : The damage done to his honour would have to be revenged.
GOOD : The damage done to his honour would have to be avenged.
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Revenge is usually used as a noun: 'Once they know who planted the bomb, they are likely to seek revenge.' 'She did it in revenge for all the lies he had told her.'
The verb is avenge : 'They swore to avenge this humiliating defeat.' 'He considers it his duty to avenge his brother's death.'
2
BAD : I'm your twin brother and I'm here to revenge.
GOOD : I'm your twin brother and I'm here to get my revenge.
BAD : He swore to revenge on the doctor.
GOOD : He swore to take revenge on the doctor.
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get/take (your) revenge (on sb) : 'He decided that the easiest way to get his revenge was to disinherit her.' 'She has vowed to take revenge on each and every one of them.'